根据句意从方框中选用合适的词语，并用其适当形式填空。 hike; gentle; be sure; although; less successful
1. My composition is ______, so I'll rewrite it soon. 2. The meeting is very important. ______ to come on time. 3. We enjoy music that's quiet and ______. 4. ______. he is seventy, he can still run fast. 5. Young people like going ______ in the countryside or the mountain.
